> like guaranteed tuition assistance per children born?

It needs to be a massive package of subsidies.

Children used to be a private good. Child-labor laws and the cost of raising kids flipped that. Children remain a public benefit, but that benefit is realized without paying for the cost. In essence, the cost of all prenatal, neonatal and pediatric healthcare; schooling; the opportunity cost in career and recreation the parents incur from having to raise kids; and the direct costs of feeding, clothing, nannying, et cetera children need to be directly subsidized, probably with a cash bonus on top.

In America this would probably be a ca. $50k/child benefit at the low end.